Experts studying sleep patterns caution that the decision by British Columbia to permanently adopt daylight time could have adverse effects on overall health, particularly for children.
Myriam Juda, a sleep researcher and adjunct professor at Simon Fraser University, emphasized the global scientific community’s concerns about the negative health and safety implications of permanent daylight saving time. Scientists advocate for permanent standard time instead.
The transition to permanent daylight time in British Columbia means that the province will now adhere to daylight time year-round without changing the clocks.
One of the critics of this move is Jamie Zeitzer, a professor in the Department of Psychiatry and Behavioral Sciences at Stanford University. Zeitzer’s research, which was referenced by the B.C. government in the announcement of the change, raises concerns about the potential negative impacts on health.
Zeitzer expressed surprise at the use of his work, stating that scientifically, the shift to permanent daylight time is not advisable and could have detrimental health repercussions.
Scientific Perspective
Standard time aligns the sun’s zenith around midday, with daylight evenly distributed between morning and afternoon. Daylight saving time, on the other hand, moves the clock forward by an hour, resulting in reduced morning light and extended afternoon light.
Juda highlighted that this alteration can disrupt the body’s circadian rhythm, which regulates sleep-wake cycles.
She explained that the circadian clock synchronizes with the sun’s light-dark cycle through specialized photoreceptors in the eye. Exposure to morning light plays a crucial role in setting the timing of melatonin release later in the day. Without this exposure, individuals may experience heightened alertness at night and increased daytime fatigue, particularly impacting teenagers whose sleep patterns tend to shift later.
According to Juda, adequate sleep is essential for the brain development of children. Communities like Vancouver and Victoria, located on the western edge of a time zone, would face challenges with dark winter mornings under permanent daylight time, with sunrise potentially occurring after 9 a.m. during midwinter.
Juda estimated that the average British Columbian could lose just under half an hour of sleep each night following the transition. Furthermore, daylight time may contribute to “social jet lag,” leading to grogginess and sluggishness due to misaligned daily schedules with the body’s light exposure preferences.
Zeitzer’s team in the U.S. has linked an out-of-sync circadian cycle to various negative health outcomes, emphasizing the potential benefits of permanent standard time from a circadian perspective.
None of the experts interviewed were aware of peer-reviewed health research supporting the shift to permanent daylight saving time. However, Zeitzer’s research suggests that eliminating biannual clock changes is preferable to the current practice. He highlighted the negative health impacts associated with the spring time change.
Public Opinion and Decision Making
The British Columbia Ministry of Attorney General stated that choosing