El Cid: Yes, there was a change in Mainland Portugal (not so in the islands) from GMT to CET around the time the Schengen Area was implemented, so as to keep the same time zone as most Schengen Area countries, resulting in the Mainland being 1 hour ahead of Madeira and 2 hours ahead of Azores. Though we didn't actually stop DST, we just didn't reverse DST in winter that year, making it the new standard time - the following years adopted DST normally, just one hour ahead.

They quickly moved it back as, since people were going to work in the dark, they were more tired in early morning and employers reported a decrease in productivity as a result. All the regulations in the world won't reform biology: human beings have an innate tendency to feel more sleepy when it's dark and to have trouble sleeping when there's too much light.