sleep_int2Brown: Recode Sleep/Wake intervals to Brown state intervals

In LightLogR: Process Data from Wearable Light Loggers and Optical Radiation Dosimeters

Recode Sleep/Wake intervals to Brown state intervals

Description

Takes a dataset with sleep/wake intervals and recodes them to Brown state intervals. Specifically, it recodes the sleep intervals to night, reduces wake intervals by a specified evening.length and recodes them to evening and day intervals. The evening.length is the time between day and night. The result can be used as input for interval2state() and might be used subsequently with Brown2reference().

Usage

sleep_int2Brown(
  dataset,
  Interval.colname = Interval,
  Sleep.colname = State,
  wake.state = "wake",
  sleep.state = "sleep",
  Brown.day = "day",
  Brown.evening = "evening",
  Brown.night = "night",
  evening.length = lubridate::dhours(3),
  Brown.state.colname = State.Brown,
  output.dataset = TRUE
)

Arguments

dataset	A dataset with sleep/wake intervals.
Interval.colname	The name of the column with the intervals. Defaults to Interval.
Sleep.colname	The name of the column with the sleep/wake states. Defaults to State.
wake.state, sleep.state	The names of the wake and sleep states in the Sleep.colname. Default to "wake" and "sleep". Expected to be a character scalar and must be an exact match.
Brown.day, Brown.evening, Brown.night	The names of the Brown states that will be used. Defaults to "day", "evening" and "night".
evening.length	The length of the evening interval in seconds. Can also use lubridate duration or period objects. Defaults to 3 hours.
Brown.state.colname	The name of the column with the newly created Brown states. Works as a simple renaming of the Sleep.colname.
output.dataset	Whether to return the whole dataset or a vector with the Brown states.

Details

The function will filter out any non-sleep intervals that are shorter than the specified evening.length. This prevents problematic behaviour when the evening.length is longer than the wake intervals or, e.g., when the first state is sleep after midnight and there is a prior NA interval from midnight till sleep. This behavior might, however, result in problematic results for specialized experimental setups with ultra short wake/sleep cycles. The sleep_int2Brown() function would not be applicable in those cases anyways. Note that any column in the dataset outside of Interval.colname and Sleep.colname will be filled up from previous states (respecting groups).

Value

A dataset with the Brown states or a vector with the Brown states. The Brown states are created in a new column with the name specified in Brown.state.colname. The dataset will have more rows than the original dataset, because the wake intervals are split into day and evening intervals.

References

https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.3001571

See Also

Other Brown: Brown2reference(), Brown_check(), Brown_cut(), Brown_rec()

Examples

#create a sample dataset
sample <- tibble::tibble(Datetime = c("2023-08-15 6:00:00",
                                         "2023-08-15 23:00:00",
                                         "2023-08-16 6:00:00",
                                         "2023-08-16 22:00:00",
                                         "2023-08-17 6:30:00",
                                         "2023-08-18 1:00:00"),
                         State = rep(c("wake", "sleep"), 3),
                         Id = "Participant")
#intervals from sample
sc2interval(sample)
#recoded intervals
sc2interval(sample) %>% sleep_int2Brown()
                                         

LightLogR documentation built on Nov. 28, 2025, 5:09 p.m.