I'm pretty sure you had a sleepless night at least once in your life. If you didn't and you aren't a dead guy like @Wodahs-oto sama, well, I envy you and you're sure to have a sleepless night tonight. Moving on!
Sleepless nights are a pain in the butt. When you have a sleepless night and feel sleepy later in the day, well, anyone can get frustrated. Just like I am right now. I feel so sleepy that I'm practically yawning my head off. Anyway, sleepless nights. Sleepless nights. Sleepless nights. Sleepless nights. Sleepless nights. *keeps on repeating "sleepless nights"*
The reason people have sleepless nights is mostly because of high sugar intake right before bed or looking at your phone/computer/laptop/tablet computer right before bed. But there are times when you get sleepless nights from tension or when you think about something very...weird. Like sometimes before I go to bed I have a lot of weird thoughts. Sometimes i feel like I am the only on in this world who is real. Everyone and everything else is just an illusion. Whenever I think this way, yelp, hello sleepless nights! But sleepless nights aren't all bad. If you have had a sleepless night at least once in your life you'll be safe from the sleepless night I'll give you!
So just remember, if you haven't had a sleepless nights even once in your life, I'll make sure to give you one! Always remember, if you can't sleep and are having a sleepless night, just get out of your bed and do something extremely boring. Studies show that you feel sleepy when you do something extremely boring. Oh, and never take sleep pills without a doctor's permission. And one more thing, sleepless nights aren't the same as insomnia. Now, have a very sleepy night! Unless you've never had a sleepless night before, that is...