a machine called; Heart !!
Researchers have looked at 20 years of records and discovered that the number of heart attacks dipped on the Monday after clocks were set back an hour from daylight saving time to standard time, possibly because people got an extra hour of sleep. But moving clocks forward appeared to have the opposite effect.
Doctors have long known that Monday in general is the worst day for heart attacks, and they usually blame the stress of a new work week and increased activity. The researchers said their findings suggest the minor loss of sleep that occurs at the end of ordinary weekends — with people going to bed later on Sunday and getting up early on Monday — might also be a contributing factor.