calm down
to stop feeling upset, angry, or excited, or to stop someone feeling this way.
sleepless
without any sleep / not able to sleep
toss and turn
to move about from side to side or turn a lot in bed, especially because you cannot sleep.
drift off
to gradually start to sleep.
chill out
to relax completely, or not allow things to upset you.
doze off
If you doze off, you start to sleep, especially during the day.
turn in
to go to bed.
perk up
to improve or become more exciting.
burn out
extreme tiredness usually caused by working too much.
sleep over
to sleep in someone else's home for a night.
race off
go quickly
nap
a short sleep, especially during the day.
drowsy
being in a state between sleeping and being awake.