My LO this past few nights has been waking after about 3 or 4 hours but I don't take him out his cot and after about 15 mins (on occasion a lot longer) he goes back to sleep. He's not upset, he's just restless, sometimes talking sometimes trying to roll. Twice he did the same last night but I didn't get out of bed and he just sucked his thumb and went back to sleep on his own. And at 4am he was trying to roll but still had his eyes closed lol, then he started whimpering a little so I brought him on the bed with me and he went to sleep until 6am then fed then slept from 7am till 8.30 then fed again. Just wondering why he might be so restless?