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My personal experience is that a warm or hot shower can make me feel good, alert and energised. I've heard others having similar experiences, some mentioning cold shower as a good method to wake up.

By what mechanism does taking (a hot or cold) shower wake us up and "energise" us?

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closed as primarily opinion-based by Chris, The Last Word, Cornelius, daniel, Bez Jun 4 at 9:45

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise.If this question can be reworded to fit the rules in the help center, please edit the question.

    
The conductivity of water is higher than that of air - the medium that usually surrounds us. If you expose yourself to water (hot or cold) it will trigger impulses in neurons that are send to the brain for evaluation - this state of "alertness" is probably what you refer to as "energising". –  Stockfisch May 19 '13 at 21:07
    
Might have something to do with more psychological factors as well... –  Zewz May 21 '13 at 11:55
    
@boo2060: Do you mean that water on the skin makes nearby neurons send signals to the brain? Without the involvement of any receptors of the skin? –  winerd May 21 '13 at 15:42
    
@winerd No, I didn't mean to say that, sorry. Of course the receptor cells are involved. –  Stockfisch May 21 '13 at 16:12
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cold exposure activates the sympathetic system, so a cold shower may make you more alert. –  karpuz May 22 '13 at 18:40

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