It's a bit cool at night,so you need a b____when you sleep

It's a bit cool at night,so you need a b____when you sleep When you can't sleep at night,it's because you're awake in s you should try to get a good night`s sleep You'll feel better for a good night’s sleep. you should aways get a good night's sleep 急需You need much fresh air when you sleep.So it's not good to You now really is a cool guy,it's no wonder that so many peo don't you think it's still a bit chilly at this time of year You need a good ______(sleep). It's getting cool. You must put on a c_____ Do you ( )every night?I sleep a sound sleep. You look so tired ._Last night I___ sleep well .A.couldn't B