Correcting the 45 minute intruder is challenging. It is like solving a mystery. There might be something bothering your baby, and you will have to figure out what it is. It could also be that your baby is undertired or overtired (although overtired babies usually wake around the 30 minute mark). Baby may be going through a growth spurt and is hungrier than usual. In your quest to solve the mystery, there are a few pages you can check out: - Find information on growth spurts and when they happen - Find out if it is time to adjust your baby's wake time - Find out if you have the appropriate length of wake times  - How to handle early nap wakings by age Your baby may also simply need to be taught how to transition sleep cycles. We did nap training with our baby, and it worked great. Find a printable troubleshooting guide to the 45 minute intruder at this page.Change one thing at a time and see if it helps your baby sleep longer.