Go to sleep and Go off

Go to sleep verb - Prepare for sleep.

Go off and go to sleep are semantically related. in drop off topic. In some cases you can replace term "Go off" with "Go to sleep", this terms are similar. informal substitute

Go off verb - To break open or into pieces usually because of internal pressure.

Go to sleep and go off are semantically related. Sometimes you can replace phrase "Go to sleep" with "Go off", this terms are similar.