Right after waking up, cortisol, the hormone that boosts focus and energy, is already high. If one drinks coffee during this time, it doesn't add much value, said Dr Aniket Mule, consultant, internal medicine, KIMS Hospital. It can increase chance of mid-morning crash. Between 9-11 am, cortisol naturally dips, Dr Mule said. "A cup during...this...time provides steadier energy," Mule stated.