We had a huuuuge long period of DD only doing a single cycle for each sleep during the day. Honestly I just gave up after a while, the stress just wasn't worth it. I instead gave myself "permission" to give her several cat naps through the day rather than aiming for two big ones. At least that way I wasn't house bound and could get her to sleep in the pram, car, etc. she grew out of it when well over a year old!