Hello. I'm booked to have one in a couple of weeks and wondered if anyone else has had one ? I have a few questions about it which are: 1. Did you manage to sleep? I am a light sleeper and I'm worried I will be constantly woken up. 2. I have to wear it to work (I work in a school) will it be noisy so everyone is aware I have it on? Would be grateful if anyone has any tips about it please.