a alycia vitarelli who has recent experience in this area has tonight's special. >> reporter: report just a little, jim. as a new parent nothing can prepare you for this whole new level of exhaustion. i'm now also learning that once they start sleeping through the night that break through does not always last, from nightmares, to fear of the dark. tonight a sleep coach is helping us all, sleep, soundly. >> there are daisy would just hate to be with her actually because i was so exhausted. >> reporter: like many new moms allison was running on fumes, sleeping less than two hours at a time. like most new borns, little cleo was still learning to sleep. >> the andrea ellison is a certified sleep coach and says you can start training a baby to sleep through the night at six months old. >> the whole neurology goes through a change, and children start to sleep more like adults. >> reporter: once they do, like now ten month-old cleo, warns sleeplessness for children comes in waves. >> people think that if a child is sleeping through the night, it will last forever and it doesn't. >> reporter