Sleep is not about how many hours you need. If your body keeps wanting to sleep over 12 hours it's probable that you're not getting sufficient rest out of your sleep, which means you're not getting proper deep sleep. Something's interrupting your cycle.
(Take it from the man who hasn't had a "good night's rest" in over a decade.)
If it persists you might face some really bad problems down the line.
If you can work out what interrupts (a smell, a sound, something uncomfortable, too hot, too cold, anything of that sort) and can remove it, then that may be enough.
It's more than possible, it's likely, that T alone has not caused this (unless it's causing muscle-twitching directly), but has contributed to it by creating a change in your system which causes you to be more vulnerable to some interruption or another.