Hi there
'fraid to say its a phase and you'll have to ride it out! The fact he can roll back and forth during the day, hopefully it will be a short phase. Give him as much time to practice his new skill as you can during the day and it'll pass! In the mean time, chin up , I remember this phase well with my first DD, it was real fun and games!!!
HTH
Clare
Mum to Anna 2 1/2 and Nathan 30 weeks