I've read reviews on first ready beds, some positive, some not. Worried that if they are noisy my DS aged 2.5 won't sleep. Have seen nap mats and a cover on site called whole kaboodle, looks like they supply nurseries, but not sure if ok for a full night. Is there a danger child could wriggle down and suffocate under sheet? Would you put child in grobag under a sheet like this? What about getting a roll out mat from e.g. futon company and putting son to sleep in usual grobag on that? At home he sleeps in grobag in cot. He's not grown out of his wooden cot yet but travel cot's a bit shorter. this fuss for a few nights away at relatives but DS likes his sleep (as do we all :) Any tips much appreciated.