Air flow is the most important thing I think. Crack the windows a little, use a portable battery powered fan. When I spent a night in my car in hot and humid weather I had a camping fan hung from the driver seat head rest pointed straight at my face. It was about six inches above my head and it worked great. If I ever do it again I'm buying some more and pointing them at the rest of my body.

1. go UP, to higher altitude. Don't go east / west / north / south, go UP. Asheville NC works for me.

2. wait until 2 AM before you go to sleep, if you have to, on a particularly crappy hot night. I can handle some things, but my furry dog can't. We just have to wait until things finally cool down.

3. roll all your windows down. No I do not believe in stealth, at all. I believe in picking places to sleep where people don't care, and that are safe. When you meet those conditions, you can certainly roll your windows down all night.

Drive to the ocean or up a mountain

Not sure about cooling mats, but you want to go with cotton sheets (as little polyester as you can afford).

If you sleep with a fan pointed at you I’ll sometimes use a damp cloth on my head/neck so the air cools it.

If it’s in your budget look into the chilisleep or bed jet mattress pads. They use water running through the pad to keep you at a constant, set temperature. Made a huge difference for my husband who sleeps horribly if too hot.

Sorry for the obvious answer, but since you didn’t mention whether you use one or not: a standing fan. I can’t survive summer without it. The white noise helps as well.

Use a fan

I find it helpful to wet my hair before bed, so it's cool as it evaporates. Baby powder helps my skin feel less sticky. 

First tip for hot weather is to keep the heat out. Sometimes (oftentimes) that means not opening windows at all. If your windows are shut, from wind and light, preferably from the outside, that won’t let in new hot air. Opening windows when it’s only a degree or two cooler outside (or hotter) is going to guarantee a bad time.

Look up DIY swamp coolers. Basically ways to pass air over ice as it melts.

Are window ACs not a thing over there?

https://preview.redd.it/z6iuyrsiee7f1.jpeg?width=419&format=pjpg&auto=webp&s=8d88879b1377b2c5720b0789bbabc153a11d1464

Try this

I've lived in warmer climates.

Expensive option 1 is a portable air con unit. Stick the hot air hose out the window and the unit will blow cool air in your bedroom. 

Expensive option 2 is a bed jet or liquid cooled mattress topper. I've been using the hydrosnooze and it's bloody fantastic. Google will tell you more.

Cheap option is taking a simple sheet, wetting it the wringing it out. Lie under it with a fan on low and you'll get cool pretty quick. Might not last the night. 

Make sure you're not using latex or high density foam pillows or mattress, traps the heat. 

Don't use polyester sheets, cotton all the way. 

Good luck

I noticed that. It explains why there are so many shitty ideas but there are a couple that actually do work.

Freezing a hot water bottle is my go to. If you put it between your thighs (where you have some major blood vessels) it really helps to cool you down. And it's much cheaper than a new mattress.

It says damp, not dripping wet, which yes a damp blanket will keep you cool when hot.

Then you never knew heat. Try sleeping at 36 celsius at 2 in the morning. You will quickly change your mind. Anything goes to ease that suffering.

The only downside is that it lasts only some minutes, 30 min at most. By then my towel was already dry.

Sleeping on the floor does work, specially when you have ceramic tile flooring, but... eeeeh it feels bad to sleep there for the entire summer. Source: been there, done that, it's annoying after a while

#17 Wear sunglasses to bed

Did this the other night. It actually worked. Bedroom was hot as shit. Couch was hot as shit. Floor felt like it was 15-20 degrees cooler. Hot air rises

Do not go to bed with wet hair. This is how you get dandruff or stinky hair. Bacteria will be going nuts in a warm, wet place with oils.

103 Celsius in shade? You most be boiling, man!

It’s in the 90’s at night here in Texas. I ain’t opening my window to melt in the heat while also being assaulted by god knows what kind of pollen.

Did this in Africa. You just get hot and damp. Not cold. Wouldn’t recommend.

Ever thought of using a small fan? The air moving over you would help immensely plus the suttle Humm from the motor is also relaxing.

Typhoon hit our city 10 days ago and power hasn't been restored. I haven't slept properly since. I will try this tonight. Hope it works. I'm desperate.

Take it to the next level; gel mats on your bed to absorb body heat.

Try sticking your feet out from under your blankets. Works a treat!

Maybe look into cooling mats for pets? Sure they’re for pets, but humans can use them too. And they truly do work when hot since they absorb body heat.

Other than that, I know most won’t find it ideal, but my family will wet half a towel, wring them out so they aren’t dripping wet, and then just lay them over ourselves.

Get cotton sheets maybe, cotton helps regulate the body temperature.

You can also place your sheets/pillowcases in the freezer for a couple hours to cool it and then sleep on

Open up the window (if you can) and get standing fan on on an oscillating mode to ventilate the room

Can you get a window a/c for your room? It would cost more in electricity, but you could close the door and be assured it would be cool. Sleeping in as little as possible helps, and not sleeping under any covers also helps. (Keep a robe on a hook inside your room for bathroom trips)

I sleep with one of those squishy ice packs. Even when they aren’t straight from the freezer, they’re cool to the touch. I usually put one on my head or neck as I’m falling asleep to help me cool down. And if I wake up hot again in the middle of the night, the ice pack is still cool enough to cool me down!

Definitely recommend a Vornado fan or air circulator! They are extremely high power, last a long time, and have a five year warranty. I tend to be extremely hot and that fan works much better than any tower fan I’ve purchased. It’s amazing. The highest level shocked me when I unboxed it. It’s medium is probably most tower fans on high. I put it in my room and it cools the entire room down. Highly recommend!

My bf and I use an ac unit that goes on the floor or a table and has an outlet the attaches to the window so not much actually goes to the window, since you dont have much space in the window. Also any kind of fan would work.

An empty soda bottle mostly filled with water (leave a little room for expansion) and then frozen during the day makes a good snuggle buddy at night. Wrap it in a thin towel or in your sheet. You might be able to put a small bottle under your neck. Keep a large bottle tucked in close to your chest. A 2L bottle can keep you cool all night.

I’ve dampened an entire bath towel and put it on me like a blanket. It actually got me chilly where I needed covers.

Have you tried taking glycine? It a calming amino acid that also lowers your core body temperature.

I used to sleep with a cold washcloth on my head like I had a fever, but nowadays I've got a small USB fan pointed at my torso when I sleep and it makes it feel much cooler.

My Mom grew up in the AZ desert in the 60s with no AC. They would hang damp sheets in front of the open windows.

Cold shower before bed, lower your body temp a bit. Make sure your sheets aren't flannel or something else designed to be warm. Sleep on the ground or in a lower part of the house where the cold will settle. Make sure you have good ventilation through the house so the room doesn't get stuffy or heat up more then the rest of the house from your body heat. You could also try a hammock, airflow underneath you will help a lot.

Cold showers, definitely yes get as low as you can, least amount of fabric possible. Fan yes, a spray bottle maybe. A frozen towel around the shoulders is amazing, but then you get wet. Sleep in the bathtub even, but not with water in that case lol. Of course drink a lot of water.

I sleep in the basement as its normally the coolest part of the house in the summer. We don't have air conditioners here either. But I have a couch, tv, and computer down there so... Why not?

Sleep with a wet teatowel or face washer

Oh that sucks man.its probably hot as hell up there. My suggestion is this. Open all of your windows, and put a fan in each one, if you think its possible, keep your apartment door open for a time as well. Let it air out and you'll make a cross breeze.

Don't shut your windows at night if you do.

Ice packs. I have the bendy gel ones and I'll wrap them in a towel and put them on my stomach/back/head. Also if you freeze a bottle of water ( to slush consistency) and keep it in a cooler you'll have a nice cold drink in the middle of the night if you get thirsty. I wake up super warm and sweaty despite AC so this kinda helps me. Good luck! 3 hours of sleep is NOT fun, hope you can sleep better soon!

I sleep in the bare minimum, fan on high, one leg out like it’s a ritual. If you’re looking for modesty, come back in December.

My daughter bought a bed cooling system. It has small tubes throughout the topper that circulates cold water, by means of a control unit. They are pricey, but very effective.

I sleep while smoking a cigarette and wearing sunglasses. It’s very cool.

Ceiling fan, stand fan, and a very lightweight blanket

Get nekkid.