log表示木头,很粗的木干。

I slept like a log last night. I don't think I even turned over in bed all night long.
我昨晚睡得像根木头，我觉得我昨晚甚至都没有翻过身。

这里睡得像根木头，就表示整晚几乎一动不动，像根死木头。

>>sleep like a baby
睡得像个婴儿一样

婴儿睡觉什么样子呢，垂着睫毛嘟着小脸呼吸很均匀是不是？

Did you sleep well last night?
昨晚睡得好吗？

Yes! I slept like a baby.
嗯，睡得特别香。

>>snore
打呼噜

He was snoring loudly while he slept.
他每晚都打呼噜打得很响。

Do you snore?
你打呼噜么？

I don't snore.
我不打呼噜。

>>toss and turn
辗转反侧

He tossed and turned all night.
他昨天辗转反侧一整晚。

>>insomnia
失眠

I have insomnia.
我有失眠症。

I am an insomniac.
我是失眠者。

Worries and tenseness can lead to insomnia.
过度的焦虑和紧张会引起失眠。