Newborns and young babies have a much shorter span in which their sleep pressure builds. They rapidly reach the peak of their volcano in one to three hours. This is why newborns sleep throughout the day, and why young babies require two or three or four daily naps.
Over time, as a baby’s sleep cycle matures he will be able to go longer periods between sleeps. It is not until age 4 or 5 that a child is able to go happily through the entire day without a nap, and sleep research suggests that even through adulthood a mid-day nap or rest break is extremely beneficial in reducing the pressure in all human beings.
The Volcano Effect is not something reserved only for children! This biological process affects adults as well. Understanding this can help you interpret what is really going on in your home at the end of a long day, when children are fussy and parents are grumpy – resulting in a whole mountain range of volcanoes.
Sleep pressure can be exaggerated by environmental issues such as the previous poor night’s sleep, on-going sleep deprivation, or daily stress. What's more, each person’s moodiness feeds off the others, causing contagious crankiness. And then you’ll find yourself losing patience and saying to your child, “I’m sorry, honey. Mommy’s just tired right now.” (This is a very telling explanation we don’t often stop to analyze.)
This Volcano concept brings to light one more important point: Quality naps can make up for lost night sleep – but extra nighttime sleep does not make up for missed naps, due to the homeostatic sleep pressure concept. Therefore, no matter how your child sleeps at night – great sleeper or poor sleeper -- his daily naps are critically important to release the rising sleep pressure.
<<<... back to 'Why Skipping Naps results in Meltdown.
From The No-Cry Nap Solution: Guaranteed Gentle Ways to Solve All Your Naptime Problems by Elizabeth Pantley (McGraw-Hill, January 2009). Here is the link for information and more excerpts: http://www.pantley.com/elizabeth/