@Dream: From what I remember reading about it, the DVD copy just plays randomly scenes as long as it stays in the DVD player. The fansub does something different, so your not getting the proper experience
Here's a comment from a Sleeping with Hinako review
Well, the problem with the fansub is that it voids the DVD/BD filesystem structure, and you get a 45 minute straight video with al the sequences in order and without repetitions.
The original DVD/BD actually lets you choose between fast asleep and uneasy sleep modes, and a 6 hour or an 8 hour sequence (it does that by looping little segments and camera angles at random intervals, like the Beckham exhibit) and the nightmare sequences and other "special" events are scattered randomly through the night (and sometimes they don't appear at all). At the end of the 6/8 hour cycle she wakes you up.
The idea of the whole thing is that you put the video and watch her as YOU go to sleep, and if you wake up in the middle of the night, she's still sleeping at your side (or in front of you, depending on your TV setup)... I bet many guys are getting early to bed but not precisely to sleep.