Man screaming in bed with alarm clocks by his head

Jeffrey Ellenbogen, a Harvard University neurologist, conducted a study in 2010 which found that some people have more sleep spindles, or quick brain pulses, that allow them to sleep through even loud sounds like car horns honking. Although the sound sleeper has the advantage of being able to sleep through interruptions, they often struggle to wake up on time for work, school and special events. Fortunately, there are alarm clocks made specifically for heavy sleepers to help combat this problem.

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