Naomi, this is a very relatable write and so often we will lie awake at night with sleep prevailing us because of thoughts well I know I do. I have a really bad insomnia problem so I can really relate to this.
The worse part is when you get to sleep an hour before your alarm is set and still wake up before it :/

All the best, Em

I can't sleep again.
It's already four a.m.;
Please bring sleep quickly...

Above are my suggested punctuation and grammar corrections. Definitely loved this Senryu. Short, but there are very few souls who can't relate to this writing! You're on a day shift and I am on a night shift, and even I was asleep before you :P Perhaps some melatonin will do the trick? It works for me, though it takes an hour to kick in.

At any rate, fix the errors and it will be a well-deserved 5!

Much love,
IdTakeABulletForYou

Love your senryu !

I write when I can't sleep....brings out a ton of emotions....

Well done!