LL - Does your H snore or have restless leg syndrome? Sleep apnea or other sleep disorders can cause excessive daytime lethargy and falling asleep early. Depression can also cause excessive sleepiness. And if those anti-anxiety pills he takes are Valium or Librium or Xanax or a related drug, they cause sedation AND it is dangerous to take them with alcohol (that's the combo that put Karen Ann Quinlan into her coma).
Please go with him to his doctor and try to straighten this stuff out. It might make a big difference.
