Baby Sleep Patterns, First 26 Weeks
Each horizontal scanline represents a day (the week numbers are down the left hand side) and the chart as a whole shows wakefulness and sleep for a single newborn subject over the course of the first six months of life. Sleep is depicted by a line; wake by gaps in the line. The dots are feedings. You can see a day/night pattern of wake/sleep forming, beginning around week 16 or so.