Thanks for your query.
Your child is having fever with diarrhea
which in most cases is viral in nature and settles in few days.
Decreased appetite and excessive sleeping is a pert of ongoing illness.
Most important is to maintain hydration.
Monitor fever every 6 hourly and give paracetamol
if it is above 100F.
Give oral rehydration solution sip by sip after each loose stool
,give coconut water,lemonade,curd,buttermilk,boiled potato,banana.rice porridge.
In case symptoms persist get him evaluated by pediatrician
Wishing your child good health.