- 1. A morning erection that is naturally caused as the brains enters the REM-deep sleep phase. At this stage, the body's skeletal muscle structure relaxes and causes hypervasodilation in the capillaries of the body, resulting in said erection. > After sleeping so soundly and having a great night's rest, it is no surprise to wake up with an erection. Source: ecdict
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morning wood
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erectionmorningbodybrainscapillariescausedcausesentersgreatmusclenaturallyphaserelaxesrestresultingsaidskeletalsleepsleepingsoundlystagestructuresurprisewake
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