My DS has always been an amazing sleeper from birth. For the last three months he has consistently slept 8-7 every night. The last week he has been in teething misery so naturally hasn’t slept much. Has settled down thankfully but when I take him for bath and bed he refuses to sleep in his cot. Or he’ll nap for 20 mins then be wide awake for hours. I’m exhausted. Is this normal? He has a solid 3 hour sleep every day late morning and is always ready for bed at 7-7.30 so I’m confused why he suddenly won’t go to bed.