Restless

I need some insight or reassurance. .Paxton has always been a horrible sleeper..however lately he will go to bed fine then wake around 1 am and literally kick his legs and then go on all fours, flop and continue this for up to 5 hours stright. It is as though he has restless legs or something...there isn't 30 seconds between movement which makes me think he cannot be getting proper if any sleep. ...I thought it might even be his teeth? I'm so lost and have made an appt to speak with Dr on Monday but any ideas?!