Thanks @slobberchops. I don't have any direct memories of near-death experiences, but my mum tells me that when I was a small child I told her that when I was ill I had "gone out of my body and up to the ceiling". Apparently this chilled her, because she realised that it could have been a near-death experience.
She knew this because she'd had a similar experience once, before I was born, when she'd had emergency treatment in hospital. She drifted out of her body and saw herself lying on the bed writhing in pain, although having "left her body", she actually felt nothing. She says that she lost her fear of death after that experience.