RS> Do you realise that some people can have their sleep patterns
RS> disturbed by strong light at night ?  Forgot to mention that.

PE> What do you mean here?  I switch the light off to go to sleep.

The problem is while you have not yet gone to bed. Some people get quite
a pronounced disturbance to their normal sleep patterns if they spend the
evening in a very brightly lit room. That makes it a lot harder to sleep
when they do go to bed, as bad as say trying to sleep at 4pm etc.

There has been quite a bit of interesting science done on that, including
deliberately manipulating peoples sleep patterns by lighting. Mostly in
the context of shift workers and international travellers and jetlag etc.
@EOT:

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