'Tis Late At Nite

'Tis late at nite,
I should be sound asleep.
Which brings the question to my mind
What is sound?
Is it an injured athlete?
Is it a horse that is unsound and cannot be ridden?
Or
Is it a noise that can barely be heard?
Is it the archaic question of the sound of a fallen tree and who is there to hear?
If you can give me the answer - I might fall sound asleep.
But that brings about the question - what happens if I fall?

Should be a sound nite for all of us
Good Night and maybe sleep tight - We cannot go on with this!
Except that tight is a bad fit or a good fit - depends methinks on who is wearing it.