Just got a bouncer from my sister and Sebastian is great in it - settles him right down when he is getting fussy in late afternoon/evening. But tonight when I put him in his bassinette, he wouldn't sleep at all, so I put him in the bouncer and he dropped off straight away. How long is too long for him to sleep in it? I figured since it's not completely flat he shouldn't spend too long in it, right? I'm planning on waiting until he's fully asleep then I'll transfer him to his bed...