I understand why countries like UK, Sweden and Norway have to change their time, because otherwise they will have dark almost at midday, and light much earlier.
But cases like here in Portugal, in my opinion is doesn´t make much sense, because there is almost no difference, and now you scared me with the problems associated with the advancement of the spring time, if it is negative for health why would we keep doing it?
Restrict that time changes to the countries that really make sense.
it's nice if its dark what's bad about darkness?