DS is 5.5 months old now and so far he went to sleep about 8:45pm last night and then woke at 5am for a bottle, went back to bed around 6 and slept til 8:40am. He then went back down for a nap about 10:15am and has been sleeping since (it's now 11:45). I wonder if maybe he's going through a growth spurt but I'm not sure if when that usually happens again. So...does anyone know when growth spurts are said to occur?