clara, not much advice to offer re sleeping sorry, however it does sound like you should seek some professional advice. I think it's all too easy to say "she'll grow out of it" but that could take months or longer. DD2 has a nightlight in her room and won't let me shut the door or turn off the hall light - I do think they're at an age when they're much more aware of possible dangers and can blow them out of proportion. If there are particular things that scare her can you change her room around somehow - e.g. my eldest used to be afraid of the shadows cast by her bedroom door which looked odd from the perspective of her bed - so we moved the bed around.
clairey - re bike riding DD1 only learned at age 7 and only because someone bought DD2 one of those wooden 2 wheel bikes with no pedals that you have to balance on and she managed to stick her legs out and roll down slopes while balancing. That gave her the "feel" of balancing and she was quite quickly on to riding her big pedal bike. Given her dyspraxia it was no mean feat for her to learn to balance. Maybe see if you can borrow one? - you may not need it for long!
As for your other thread, my one and only advice is that you MUST look out for yourself first and foremost in all of this. What's done is done and nothing will be served by feeling guilty. Go to the police, change your phones, close down your FB page do whatever you need to do to get some peace. I'm also inclined to think there is a third person involved here but although it would certainly satisfy your curiosity to know who that is, it probably won't change anything. If you're worried about xH I'm sure you can find a way to explain why you would change your numbers etc. Someone said to me once "work out what you want the end result to be first - what is best for you and your family - then work out what you need to do to make that happen" and I've found it to be very good advice.
I'm writing this from Singapore airport - I'm on my way back to New Zealand. The holiday was great, especially the Cambodia bit, but I'm ready to be back with my girls now. Not so sure about going back to work on Monday mind you!