I took 10 mgs Ambien for the first time last time and it's probably the best night of sleep I've had in ages. About 10 hours after I initially took it I started to feel jittery. It's a physical sensation vs. making my brain awake. Has anyone else had this happen? I'm curious to see how long this lasts. And I only plan on using this every other day at the most. Just part of my sleep med rotation.