Letter: Put a sock in it

Sir: Once again scientists present us with research to show us facts that have been well known for generations (Science Update, 3 September).

Apparently wearing socks in bed helps you to sleep. On a recent visit to the lighthouse museum at Ardnamurchan Point, I saw a medical handbook for lighthouse keepers. It was open at the page for insomnia and suggested the first line of treatment was to wear socks in bed. I have always found that having warm feet helps me get to sleep and wear socks in bed for most of the year. I feel better to know I'm acting on scientific evidence.

The second astounding fact in your Update is that there is no point in switching lanes in queues of traffic because they all move at the same rate. No!

SARAH LAWSON

Edinburgh