My son has a mid-height bed (just for the little dwarfs, who by the way urgently need to use the toilet at night. Conclusion: It sleeps great there, changing the sheets is so damn awful, making the bed is also annoying. After 2 days of getting used to it, you can get down to pee at night really well (if my 3-year-old can do it, then so can the older ones). A subtle night light can help with that. If a loft bed is to be advertised, then rather as a gallery bed with a proper staircase.