restless legs syndrome
"I've been on Gabapentin for a couple years at bedtime.  When it 1st started (8 yrs ago) I only got restless leg syndrome while sleeping. It would wake me up. For the past 5 years I get it mainly once I sit down for the night.  Now as long as I can get up & walk or sway for a few minutes it usually goes away. I'm not really sure if it's working or not. I still usually get it at least once/every other day. Just glad it goes away once I get up now."