He asks to go to bed at 7.15 most nights, seems to be sleepy but then is still awake when DS1 goes to bed at 8, still awake after DS1 has gone to sleep and it is usually about 8.30 when he drops off.
He just lies in bed for that time - doesn't really make much noise, doesn't get up and out of the bedroom....just lies there listening to Thomas audio stories and staring up. I offer him books to look at but he will not have them in bed with him - just wants to lie there quietly.
Not sure if I should be concerned - he still has a nap most days after lunch (if he doesn't he falls asleep at 4ish and then that just compounds the problem). It is great that he is happy to lie in bed for all that time (particularly as DS1 would never stay in his bedroom and would stand at the stair gate shouting etc etc).