Other ways to say "I'm going to sleep":
1. I'm off to bed.
2. I'm going to bed.
3. It's bedtime.
4. It's past my bedtime.
5. I'm going to hit the sack.
6. I'm going to crash.
7. I'm going to hit the hay.
8. I think I'll retire for the night.
9. I think I'll say goodnight now.
