The pins & needles come and go throughout the day. The only thing I experience at night is the twitching in my legs. This is usually only below the knee on either leg. It's not always the weaker/heavier feeling leg.
I wake up a few times every night too. The doc gave me lexapro to help this. I haven't seen much of an improvement yet.
The pins and needles sensation sometimes gets worse at night. But I tell you what I really get at night, the all-over body twitching! It's annoying as heck, too. When I'm trying to fall asleep (which is hard enough in itself), different parts of my body twitch!
I have sleeping problems, too. I have a hard time falling and staying asleep. My neuro told me it is totally unrelated to MS, but I'm not so sure. There is still so much they don't know about this disease.