If you still can't get into working mode and force yourself to do something, then it's that January brain to blame. As scientists explain, long holidays "change the regulation of sleep, wakefulness and biological clock cycles," so a sharp return to routine is a real stress for the body. Natural light, sports, vitamin D and an adequate sleep regime will help you return to your usual routine. Psychologists also advise not to blame yourself for not wanting to do anythi