Dylan is 3 months old and has been formula fed since he was 7 weeks. He has a bottle at around 6pm, then has a play then sleep. He would go into his long sleep then if I let him, but I find that by waking him at 9.30 and giving small feed then bath, he sleeps through longer, usually waking around 5-6 for his dummy then around 8 for first feed. This is certainly not set in stone though - sometimes he still wants a bottle at 5am!