Go to bed/go to sleep/ hit the sack etc.

Q1) Do you use or hear all of them when talking about sleeping?-- I seldom hear 'hit the sack' anymore.

Q2) Doesn't 2 have another meaning?-- Not that I am aware of.

Q3) What other expressions are there?-- Oh, there has been other slang around over the years: turn in, hit the pillow, catch some Zs...

Thank you ^^

In my dictionary, 2 has this meaning: be unable to feel anything in your leg, etc. because it has been in a particular position for a long time.

and what is Zs in 'catch some Zs'?

I go to sleep at 12 does not mean to lose feeling, or get 'pins & needles', in a body part. In the first place, it is involuntary so it cannot be timed, and in the second place, it is the body part, not you yourself, who falls asleep: My leg fell asleep while I was watching Gone the the Wind today.

Thank you^^

You mean, we say 'I go to bed at 12', but not 'I go to sleep at 12?' Then, do we say, 'Hey, I'll go to sleep soon'?

And the definition I brought for 'go to sleep' is not used? (I don't understand 'In the first place, ~~ in the second place' well?.?)

No, no. You suggested that 'go to sleep' could have the 2nd meaning (lose feeling, etc) in your sentence, and my post is denying that, nothing else.

I reviewed this post again today.

I got question after reviewing this post again today.

Mr.Micauber said in the first answer '

Q1) Do you use or hear all of them when talking about sleeping?-- I seldom hear 'hit the sack' anymore.'

Here 'anymore' means, you hear 'hit the sack' less than seldom?(emphasising you don't almost hear it?) or you hear it often?

Anymore (one word) = nowadays as compared to previous times.

The adverb anymore meaning “any longer” or “nowadays” is most commonly

The Z's in catch some Z's Referrs to cartoon phrases of sleeping Zzzzzzz. kind of concept. So pretty much dreaming or sleep notes.