My mum got out of hospital last week after getting radiotherapy 3 times a day for 14 days. She was totally fine during the treatment but now she's home she is exhausted. She sleeps all the time. Is this normal? It's having a knock on effect with everything else. She's not eating or taking her medication because she's always asleep. If this is normal how long does the tiredness normally last. I should have said my mum has lung cancer and is 80 years old