Hey! One Of My Relative Had 4-5 Sleeping Tablets Together

Hey! One of my relative had 4-5 sleeping tablets together last night.. Though we took him to hospital within half and hour and the doctor suggested us clinically there has been no sign of drug overdose...
So we brought him back home, but he is still really sleepy we have given him morning tea with 2 rusk and in breakfast 2 sandwiches and cold coffee. Please suggest me any home remedy to treat this sleepiness faster
And can he have any serious health consequences after this incident ?
Please help.