Thanks CarolJ
I am sooo pleased the good weather has finally come along but didn't realise it helped us to produce Melatonin! Leon is, shall we say, 'choosy' as to when he is happy to play out in the garden, sometimes for hours other times he will stomp back inside after 5 minutes!!
But I will definitely encourage him to stay out there longer and see if this helps with his sleep.
Thanks again
Joy