L.,
Your child is changing and growing every day and so to will his sleep patterns. I remember the day that mine slept throught the night for the first time. I awoke ---it was after 7pm---- and I thought he had died because he had never slept throught the night. He was 18 months old. He was a sickly child.
Babies change and as they do their need for sleep changes. Also babies go through growth periods and during this time (5-7 days) they do not sleep well because their bodies will grow about 1/2 to 1 inch over night! It is a huge thing to grow this much in 24 hours. I was always thinking they grew in miniscule bits at a time but was enlightened by my doctor. Leading up to this time their are HUNGRY, CRABBY and their sleep patterns are way off. This might be the cause. Another cause might be that teeth are eurupting and waking him up and the pain is causing him to not be able to settle back down. Also, it could be foods that will cause dreams to be more vivid and make him wake up (cheese and dairy were the bad guys for my kids). Another reason is that as the seasons or tempature changes, hot to cold or cold to hot, so does a child's sleep patterns. Have you been experiencing rainy or stormy nights. Has the season become more hot or more cold?
I also note that my older children would begin to wet the bed when the weather turns cold for that third week in October. The body is now working harder to stay warm and they are in a deeper sleep and just don't wake up and so they wet the bed even though they have been dry for years!
So in conclusion.
1. growth peroids
2. teeth coming in
3. seasonal change
4. diet change
5. body need less sleep due to getting older
By watching your child and noting what has changed in his little world you will be able to see what has caused the effect of sleep change. REMEMBER there is always a reason for a change in your child, you just have to be aware of the changes in his daily life to notice why things are changing. The last reason a baby may have his sleep patterns change is he is missing you! Has your daily time with baby changed? No matter the reason the truth is babies are not going to sleep all the time like they did when they were infants-long periods. As they grow their brain needs less sleep and they have more frequent awake times. Good luck! As my mother of seven children always told me SLEEP WHEN YOUR BABY SLEEPS-no matter the time!
Keep Mothering!
Ms C.