Dunderheads! They're all dunderheads! How on earth the Muggles ever manage to understand anything I will never know. All the things that they've been thinking for years about our world since that bratty Rowlings decided that she could profit after all from being expelled and having her wand snapped… none of them have any SENSE.
Dreamless Sleep potion is not habit forming. Taken too much it can lead to insanity. The human mind NEEDS to dream. Without dreams – even if one cannot remember such dreams, the mind sees things when awake. Their scientists know and understand this, why can't the people who think they understand the Wizarding world enough to make free with our lives understand this? REM sleep is important, it's where we dream, Dreamless Sleep Potion does nothing more than cancel REM sleep.
Dunderheads.
