... Technically, if I do not level up, then the vampire attacks never start, correct?

It's not tied to your level. It's a quest specific trigger.

are you sure? with me everything Always starts at level 10

I think all of mine starts at level 10 to. Why I asked.

Dawnguard triggers once you reach level 10 - Durak travels Skyrim on a recruitment drive for the Dawnguard at that point. However, you can go to Fort Dawnguard prior to reaching level 10 and activate the quests yourself.

If you don't like the vampire attacks, you can download a mod that lets you decide what the level requirements are for the quests to trigger. People who don't want the quests happening at all usually put level 81 as the trigger (provided you're on PC of course...also I forgot the name of the mod).

There are ways to minimize the effects, basically, never Fast Travel to a town or settlement or walk around in a city after 6PM until 8AM. This can be inconvenient.

So, it is best to not have DG trigger until you are ready to focus on that MQ.

BTW, the reason the attacks cause problems is they happen when the commutes happen. You know how when you first come into a city a say 5 or 6 or 7 PM, there is a crowd near the gate? Those are the NPCs coming in from the fields or going out to their houses. The problem is, if you don't enter a city or go outside in a city until 8PM, this commute can still trigger. so all the NPCs are crowded around cell entrances and then DG throws a Vampire attack in.

So, if you can trigger these commutes, by waiting for one hour increments starting at 4PM near the town entrance, up until 8PM, this will get the commuters to appear, then get them home. then the Vampire attack that happens will affect the least amount of NPCs. Mostly respawning generics.

There are mods for this for the PC that can delay DG or other DLCs until you want them to trigger.

Hrm, I read on this forum somewhere that the CK spawns vampires from 9PM to 6AM, and in all that time playing, following that pattern, I've never had vamp attacks in populated areas. Now, I CAN have misread this, but I still feel like it's worth mentioning as 6PM to 8AM does leave alot of room to explore cities.

Probably a bug..? Because they attack during the day.

i saw a vampire attack during the night, honestly i dont consider this a bug i mean they are vampires it makes more sense to attack at night

Dawnguard can still be started lower then 10 but you won't get the Vamp attacks if you don't start the quest at lower levels. The Vamp attacks only start happening when you get to around level 8-9. They should stop permanently when you finish the questline assuming you don't fire any bloodcursed arrows at the sun.

I was referring to the bit about the CK. Obviously that isn't the case and they attack at day and night.

Timing is everything.

Awesome mod. Level 30 vampire attacks... Yes.

Of course, there are some that are scripted to appear during the daytime. Most are actually at night though.