When DD was little I used to do that. Gave me 45 minutes to shower have brekkie and do some yoga in the peace and quiet.
I should do it now, but DS is such an unreliable sleeper with supersonic hearing (and he sleeps with me), that I'm not sure it would be great in practice.
Only way to find out is give it a trial run. Maybe give it a go before DH goes back to work so you know if you need to fine tune the theory or not.

