A winter crossing may be especially difficult for overnight workers, since their pace of sleep is often disturbed by working times.

Although changing the clock gives some people an extra hour of sleep, for tour workers that does not necessarily mean extra rest.

The body has an internal biological clock that regulates sleep, wake up, and release of hormones, mainly by light and darkness.

Those who work at night need to stay awake when the organism prepares for sleep and rest during the day, when the body is naturally more active. This may make sleep difficult and cause them to feel tired after rest.

During the winter crossing, the clock between 2pm and 300 is repeated. For this reason, tours involving this interval can last an hour longer by local time. For workers who are already tired, this may add to the difficulties of working.

Sleep deprivation can affect concentration, memory, response time, and decision making.

These consequences are especially important for professions requiring constant attention, such as health workers, drivers and production workers. However, not everyone reacts to the time difference.

To facilitate the adjustment, experts recommend keeping a regular sleep schedule and creating a dark, quiet, and cool resting environment.

Light can help preserve alertness during the shift, while avoiding presleep caffeine can facilitate rest.

Proper time for exposure to light depends on working time and on whether shifts are stable or often change. /Telegraphy/