Is it possible to be too tired to fall asleep?

I don't think so. I think when that happens, what's actually preventing you from falling asleep is that you've got too much of what they call in Ayurveda (Asian Indian medicine) "vata", which makes you restless, anxious, unsettled. And if you're really tired on top of that, it can seem like it's being too tired that's keeping you awake. But if you're that tired you should just drop right off.

Yes, it happens to me all the time...course I have a lot of other sleeping issues as well but...that is one thing that keeps me up sometimes.

Yes that's what I keep going threw and I haven't used meth for a month so far

Yes, it's called being "over tired"...