This may be because the attentional short-sightedness induced by alcohol makes all our shortcomings float away and so we feel closer to our ideal selves.

But when we read in low light, there may be a "double whammy" effect because other changes may happen that also encourage the development of short-sightedness - but in a completely different way.

But being born in the summer can have drawbacks - such as an increased risk of short-sightedness.