Report 2

Data

In the report, we will use a modified version of the msleep dataset from ggplot2 (Wickham 2016). Updated sleep times and weights were taken from Savage and West (2007). See Table 1 for a codebook.

Table 1: Codebook for the msleep dataset

Column	Type	Definition
name	character	common name
genus	character	scientific genus
vore	factor	type of diet
order	factor	scientific order
conservation	factor	the conservation status of the animal
sleep_total	numeric	total amount of sleep, in hours
sleep_rem	numeric	rem sleep, in hours
sleep_cycle	numeric	length of sleep cycle, in hours
awake	numeric	amount of time spent awake, in hours
brainwt	numeric	brain weight in kilograms
bodywt	numeric	body weight in kilograms

Plots

Brain:Body Weight

As the brain:body weight ratio increases, so do total sleep hours (Figure 1).

Figure 1: Total sleep by brain:body weight ratio

Diet

There is not a clear relationship between sleep and diet (Figure 2).

Figure 2: Total sleep by diet

Sleep by Order

Animals in different orders have very different median total amounts of sleep (Table 2).

Table 2: Median total sleep, REM sleep, and percent of REM sleep by order

Order	Median Total Sleep
Rodentia	12.9
Carnivora	10.2
Primates	9.9

Brain:Body Weight by Diet

As the brain:body weight ratio increases, so do total sleep hours for carnivores and omnivores, but not for the other diet types (Figure 3).

Figure 3: Create your own plot and figure caption to illustrate this

References

Savage, Van M, and Geoffrey B West. 2007. “A Quantitative, Theoretical Framework for Understanding Mammalian Sleep.” Proceedings of the National Academy of Sciences 104 (3): 1051–56.

Wickham, Hadley. 2016. Ggplot2: Elegant Graphics for Data Analysis. Springer-Verlag New York. https://ggplot2.tidyverse.org.