Hi, My daughter is 2 years and 10 months old, and has recently transitioned from her cot to a junior bed (with guard rail). I have two questions: Is it safe to use a sheet - she sometimes asks for this instead of her sleeping bag. So far we have only used this for her daytime nap. She has also started to ask for a pillow when going to sleep at night. So far I have let her use a smallish pillow to fall asleep and then removed it. Is she old enough to have a pillow, or should I wait a little longer? Thank you.