I have shared care of DS 50/50, very amicable friendship with his dad.
I'm 7 months pregnant and I'm assuming this is the trigger for DS suddenly playing up at bedtime. He only does it here though
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He has come up with so many reasons as to why, and it really does reach the point where the excuses are SO ridiculous that I start to think actually he is attention seeking rather than actually suffering anxiety.
Last night he was up and down declaring he could not get to sleep until half twelve, having gone to bed at his usual 7pm (lights out at 8).
Tonight we had the same routine.....he is fine until lights out, when we kiss and cuddle and say goodnight until the morning. As I was leaving his room he started crying and saying he was panicking 'in his head' already. I gently told him he just needed to lie down and listen to his CD. He has a night-light on too.
I have tried to use the approach of giving him more of me, more time during the day, letting him choose activities and more time at bedtime with extended cuddles etc and it has seemed entirely counter productive as he drags it out ALL night getting progressively more wound up each time I try to leave to go to my own bed. (he's in the top of his bunk beds, and insists he must be in his own bed so I can't co-sleep or even get in there with him!) The worst night of this he didn't fall asleep until 2am 
Now we're trying the no-nonsense approach of telling him that at lights out he is to stay in bed.....last night that didn't work. Tonight I've told him getting up for attention will see the removal of his hand held games console.
I feel pretty dreadful at resorting to this tactic but at the moment sleep deprivation on top of other pregnancy issues just makes me so ill I struggle to function during the day so I'm having to do whatever I can to get sleep.
DH is being fantastic, but as mums will know - even me being in bed doesn't guarantee rest because I hear every time DS gets up and I end up awake with worry.
I don't want to fall into the trap of being manipulated by my DS for attention (he has tried this before in the past) but equally I really don't want to ignore him if the anxiety he feels is real (as an anxiety sufferer myself I have sympathy towards how irrational and consuming it can be).
Has anyone got any advice or experience to help me deal with this?