Parents are urged to keep sleep logs, nap logs, and night - waking logs. (babycenter.com)
I suggest that you have at least 7 days of sleep logs completed before you begin sleep coaching so that you can look for patterns, as well as similarities between your babies. (twiniversity.com)
They used sleep logs and self - assessments (the «Parenting Stress» index) to draw a connection between baby sleep and parent sleep. (wehavekids.com)