We all know that driving with too much alcohol in our system endangers lives as can driving while dehydrated, but there are other surprisingly common things that can affect your driving ability which you may not be aware of. Most of us love a cuppa, but did you realise that some herbal teas can make you feel drowsy? Herbs such as chamomile, lavender and valerian are known to have mild sedative properties to help you relax. While these teas may be good for helping you to nod off at bedtime, they are not recommended if you’re about to get behind the wheel. Those of you who like a brew in the morning before driving off should stick to beverages with caffeine and avoid adding honey. According to the RAC, research has shown that because honey contains glucose, this hinders the production of orexin, a hormone that makes us feel awake and alert.