Probably don't get an awful lot of people not waking up after spending the night under a tree but it is worth mentioning the same thing happens in ponds, people fill the Goldfish pond up with 'Oxygenating' weed which does just what is described on the box during the day but at night it takes in Oxygen and puts out CO2. which is why quite often especially after a warm night the Goldfish are up gasping around the surface in the morning.
Interestingly (or maybe not) I understand it is why flowers used to be removed from hospital wards at night.
DB.
Interestingly (or maybe not) I understand it is why flowers used to be removed from hospital wards at night.
DB.