The 4 month sleep regression is a time around 3 to 4 months old when your baby's sleep patterns change and your baby needs to go through sleep cycles -- light sleep to deep sleep and back again. As a result, your baby will likely wake frequently at night and take short naps. Sleep regressions are exhausting but you can help your baby sleep better! Here is the ultimate guide to getting through this period based on my 10+ years as a sleep consultant. What is The 4 Month Sleep Regression? The