Anyone using or had experience of a sleepyhead grande? I've used the small one to co-sleep since my son was born but, at 4 months, he's pretty much outgrown it. We're wondering whether to buy the bigger one to help the transition to a cotbed (and for holidays etc). But should he have more freedom of movement now he's bigger, and will the sleepyhead restrict his movement? Could it now be contributing to his worsening sleep or is that likely to be the dreaded 4-month sleep regression?? Don't want to waste £150. And would like to go back to only one wake-up per night! Tia x