Fitness trackers with smart alarm clock

Smart alarm clock

— this function adjusts the time of the alarm to the sleep phase of a person. Depending on the phase in which the user wakes up, further well-being can vary greatly — from vivacity and upsurge to lethargy and apathy; a smart alarm clock selects the phase in such a way as to minimize the discomfort after waking up. The specific time of the alarm can vary within half an hour (plus or minus), but usually, the settings of such an alarm clock allow you to set the getting up "no later than ...".