Insomnia 失眠（症）
Sarah suffers from insomnia.
Sarah饱受失眠困扰。
I had insomnia last night.
我昨晚失眠了。

Oversleep 睡过头；睡得太久
I'm sorry I'm late. I overslept this morning.
对不起，我迟到了。我今天早上睡过头了。
You really need to stop oversleeping or it will affect your job.
如果会影响到你的工作，你就真的不能再睡懒觉了。

Morning person 早起的人
I'm really not a morning person. I hate getting up early.
我真的不是早起的人。我讨厌早起。

Stay up 睡得晚，熬夜
Mom, can I stay up and watch the movie?
妈妈，我可以晚点睡，看电影吗？
I had to stay up all night to finish my report.
我得熬通宵写报告了。
Don't stay up late. You have school in the morning.
别熬夜。你早上要上学。

Sleep in 迟起；睡过头；睡懒觉
I can't wait for the weekend so that I can sleep in.
我等不及到周末了，周末我可以睡懒觉。
Sleeping in is my favorite thing to do on a day off.
睡懒觉是我放假的时候最喜欢做的事情。
I had to hurry this morning because I slept in.
我今天早上特别匆忙，因为我睡过头了。

Heavy/Light sleeper 睡得很沉的人/睡眠很轻的人
Sleep like a log 睡得很沉
Nothing wakes him. He sleeps like a log.
什么都叫不醒他。他睡得很沉。

Sleepless 睡不着；失眠
I'm so tired. I had several sleepless nights this week.
我太累了。这个星期，我失眠好几晚了。

Hit the sack 去睡觉，就寝
Alright, kids bedtime. Time to hit the sack.
好了，孩子们，睡觉时间（到了）。要去睡觉了。

Get some Zs -- Sleep (America and Canada only) 睡觉
Man, I tired. I really need to get some Zs.
哥们儿，我累了。我真的要睡觉了。
I feel good. I got plenty of Zs last night.
我现在状态很好。我昨晚睡眠充足。