DS always been a rubbish sleeper but had been getting better. The last week or so he has been sleeping from 7ish until about 11 then waking every hour until 5am which is time to get up apparently! He self settles at bedtime without me in his room and and night I can sometimes just tuck him in and he goes back to sleep or a bit of bum patting will get him back to sleep. He isn't crying hard when he wakes, sometimes just shouts 'Mummy' until I go to him (his talking is quite advanced). Is there a sleep regression at this age?