Interesting experience Ion'..

Buddhist say that we have different counciens/ there are 3 main ones.
to keep it simple the first is the one we use to comunicate in our everyday life, part of this one and the second one we come in contact when we enter the dreamworld.. so from my point of view you may had experienced a sutil drift towards a higher stage of counciensness in your dream counciens./
If you wanna reach higher states of counciensness you need to have a high level of Shamata (attention meditation) and to learn emptyness. so you can see your Ego as empty and the same time see your dream empty and seeing the Observer that is seeing all this emptyness empty as well..
Emptyness means that you realize that thing are only a metal proyection, they are made of parts and thouse parts of more parts and so on.. that you are only seeing them this way in a temporary way// that karma forces to see reality this way..// **(this is a dream/ Samsara)** we need to wake up..
as you felt it in your dream.. that joy and happyness is just another state of counciensness, in Meditation you have a method to medidate in higher states of counciensness to loose the attachment towards this life.
Shamans sometimes use mushrooms or other plants to creat this temporaty but higher states, for the same purpouse.. sure dream can be used to do this..

As your practise becomes higher // for example tantra levels// your are going to use LDs as s very important plataform for your practise..

I hope we can share exprience and knowledge/...//

looks like you have been into LDs for a while.. maybe you can help me out.