You should try it !!!
It is more than just awakening, infact this sudden blast of cold water stimulates many neurons and nerve endings, which is supposed to be very good for your health and general well being.
Even if you are experiencing some dull sensation in some muscles due to inactivity, then this blast of cold water also helps to stimulate and awaken, thereby removing the dull ache.
Its really been like that though. So much has just fallen into place spiritually lately. Its like someone up there or in my heart has set me on this perfect path. Such beautiful blessings!
Water of any temperature can't cleanse you 'within' - only Naam can do that.