So for the past 4 weeks my girl has been in the grobag and sleepy wings and really starting now to want her fingers or thumb in her mouth so I have let her have day naps with one arm in and one arm out the sleepy wings. Last night she had her first full night sleep with an arm out. No probs so far. I think if you just transition them slow enough they get used to it but I have taken the cues to do it from my bub!