Figure 2.

The movement states for one human-dog dyad across a selection of sleep periods (nights). These illustrations reflect a variety of movement patterns by dog and human when co-sleeping. For example, dog and human sleeping together with little movement (night 8); bouts of high level of dog movement with little human movement (nights 2, 4, 12, 13); and, high levels of dog and human movement (nights 6, 9). Each cell represents a 1-minute epoch, and should be read from bottom left of matrix to top right. Beginning of period indicated by S (start) and completion of sleep period indicated by F (finish). ▢ = no human or dog movement; ▲ = human movement only; ◯ = dog movement only; ◯▲ = both human and dog movement.