The siesta is still very much respected in Valencia. The hours vary: some places close 1.30-4.30, some 2pm-5pm, there are more variations. The only way to really make sure you won’t be faced with a closed door is to arrive before 1pm or after 5pm. The siesta is respected by following:
Opening hours vary greatly too – some shops will open at 7.30 am while most won’t until 10 am.
The closing time is usually 7.30 – 8 pm.
Large supermarkets, megastores and shopping malls are usually open throught the day without the break – until 9 – 12 pm
The places that traditionally work through the siesta are the ones serving food, for obvious reasons.
In short – expect everything to be closed 1.30-4.30pm, apart from places that serve food or large mega shopping places.
So get up early, get tired, spend the siesta eating, relaxing and perhaps walking around some pretty places that don’t depend on people, and get ready for the second round of daily city life.