This isn't the first post about this topic, and it will probably not be the last either, but some times you need to repeat good ideas until they get enough momentum to break through.
This year's Dremora skulls have exacerbated an already present issue, one that has also resurfaced with the undaunted daily rewards and the daily battleground reward.
The current reset of daily quests and rewards is an ugly mess. Some things, like daily rewards, reset at 1 in the night (EU time), the daily quests such as crafting dailies and others, reset some time in the early morning, 7 or 8 I believe depending on daylight saving or not, and many of the daily rewards, such as the undaunted reward, the battleground reward, the shadowy supplier, horse feeding, and now also Dremora skulls, are on a 20 hour cooldown from when you used them last. All in all, an utter mess, especially since there is no visualization of the dailies you have on cooldown, such as the Dremora skulls.
Ideally, all of this could be put on the exact same, fixed reset time. So at a specific time, either that of the daily rewards reset or the daily quests reset, everything would reset to a new day. Daily quests go on to the new day, and also daily rewards, such as the ones currently on a 20 hour cooldown.
The community has been asking for this several times now, and it's a quality of life improvement that would mean people can stop using addons or watches to track an ever increasing host of daily rewards and their 20 hour cooldown.