Alicia Keys has banned her mother from touring with her after watching her crawling out of a bunk on her tour bus.

The singer admits the incident made her realise her mum wasn't suited to life on the road and now she tries to put her up in hotels instead of finding her a place on the bus.

Keys explains, "She doesn't travel with me now. That happened because, one time, I saw her trying to get out of one of those bunks in the tour bus and it looked really scary.

"I was like, 'Ma, this is not right.' (The bunks) are like little coffins, so that was one thing (and) it's kind of small and she was crawling out on her knees and I was like, 'Oh my God, what am I doing to her?'"