Coming across a terrible dilemma | Brief letters

Ejaculation v sleep | Night-time stress | Brabazon legacy | Learning from mistakes | Pint or pony of porter

I was struck by two adjacent headlines: “More frequent ejaculations may boost men’s fertility” and “Extra 11 minutes’ sleep each night can reduce heart attack risk”. What a terrible dilemma. Prof Gareth Williams Rockhampton, Gloucestershire

• Given the impact of stress on the risk of heart attacks, I wonder how the worry about not sleeping for an extra 11 minutes is going to help me. Richard Barnard Wivenhoe, Essex