In 2017 there was a high-profile BBC documentary that generated a lot of interest in the potential for FOS fibres to help with sleep. Whilst the research featured in the programme was very interesting it was a preliminary rat study, and we base our recommendations on the results of gold standard human clinical trials. If you'd like to try Optibac Probiotics Bifido & Fibre note that whilst we usually recommend that our probiotics are taken with breakfast, this supplement is fine to take an hour or so before bed, as the programme suggested.