I have the same problem, I find it hard to sleep at night, sometimes I find myself still awake at 7am and then sleeping for about 3 hours and feeling like crap for the rest of the day.
For a while I was staying awake 38 hours every few days and It wore me out, I was moody, Weak, I Felt sick all the time... I didn't even get that drunk for my 18th, the day I turned Legal, because of the fact I wasn't sleeping and completely messed up my sleeping patterns.
I'm slowly sorting it out now. Monday night and the whole of Tuesday, I stayed awake. When it came to around 10pm tuesday night, I took a Nytol, waited half an hour and I was out for the count.
I ended up waking up at 8am Feeling great.
I don't always take sleeping tablets 'cause I try my best to avoid tablets and stuff, but it got to the point wwhere I needed to.
If you don't want to do that, theres other ways of helping you fall asleep easy; Staying up and being active throughout the whole day will tire you out, Having a hot bath with candles (helps you relax and weakens you that much, you feel you need to sleep), and even though Im not much of a reader, reading a good book will definetly get you to sleep fast. It worked for me.
If you're still having trouble, you should see a GP, they'd help you
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Good luck! ๐
xo