My younger had endurance! I worked until 11pm, came home to him wide awake, took him right to bed, had to hold him so he wouldn't be able to keep getting up, lay awake until he was asleep...2am, 3am, 4am...once 7am! And with my older one getting up like clockwork at 8am, what's the point of going to sleep! This was EVERY NIGHT for at about 10 months! I was so sick during that time!