1. Yes. You are right there. Some are, some are not.
Above all, it depends on our God wants to communicate with you, or how far the devil would go to intimidate or attack.
You know..? Tuesday are all Tuesdays but each Tuesday has it own significance?
Each day with it own mystery.
2. It's normal.
But mind you..? It could be as a result of attack, to stop us from fighting back or seeking solution to whatever evil the enemies want to inflict us.
At times it could as a result of daily activities or stress.
In any case you must mediate, pray with Joel 2:28 to remind God of his (revelation/dreams) covenant.
3. Yes. You are right there, and that's why one mustn't joke with his/her dream.
Dreams are the reflection,reality of what's to come or has come.
Dreams are our soul/God, from the lords throne.
Hence, the parable : " our God can fail but your God can not fail you " meaning, vision by/through man of God can be manipulated or twisted to suits their needs/flesh, but you dream is you, the lord himself talking to you directly.
Have come across members who came to me(called) and complained about vision or prophecies only to find out(through their dreams) that it's contradicts God's. So you see? You God first before man of God.
Tell me, if all being are to hear the voice of God through men of God alone, then who do you think human should bow/worship before?
So, you see why God communicate with us individually?
4. No. It doesn't mean they are more or less important. I guess that why i'm here?
Above all, I belief this question has been answer in No. 2. But to add to that, like I maintained in No. 2. The devil uses this to hide the truth from us or prevent us from knowing God's minds as regards that day or our life/future.
And truly sometimes it's might be due to daily stress/activities or lack of prayers/attention that derives us from such important message or warnings.
Above all, pray, pray and asks the lord to help you remember your dream whether it's significance or not - you have the right to know/remember you dream no matter how significance or otherwise it is.
Bless u