Dream Analysis: mutual dreams

my partner and i of almost 4.5 years now were falling asleep one evening in the same bed arm in arm. we both very tired seemed to be drifting off deeper and deeper at the same time. almost could feel this draining from my body leaving world. it felt as tho we were somehow still together while this happend. i suddenly recall being 3 blocks from home in a parking lot.
i was backing the truck out and my partner talking to me helping me backout. the conversation was heard in and out but some sentences were im only down the street, theres no cars, nah i wana just go home, ok lets go home, these exact words exchanged were all i remember i could hear. at this point i realized i was dreaming and i could feel and hear both in dream and out of dream. in dream i looked at my partner and said you know were dreaming arent we and in bed physically i felt myself shake my partner to try to wake her up while aloud i said i am still dreaming or not...i could like see or feel..both i mean like being back in myself now physically moving around in bed smiling kinda laughing and i asked outloud did you just answer me and my partner sayd wait yeh..then i said but in the dream...and she said i think so..my eyes still shut laying still i asked are we in the car or were we just now and she said no we were dreaming.
at that point now awake i rolled to look at my partner and i asked her if she was awake and she said yes and i said weird i just had a dream but it was short like 20 seconds it seemed it was weird we were down the street in the car and...she inteupts me and says in the parking lot and i was looking behind u for cars so you can backout...and i was like woah that didnt really happen then...and she said not in real life but i think i dreamt that too...
so i asked if we were talking and she said yes and we both explained the same sentences only we both heard which were the same ones i had mentioned i could briefly hear. we both can discribe the scenery as being late morning time shady/overcast between late spring early fall time still moistend air from a rainfall earlier so the ground was dark wet look but no puddles. it wasnt cold just reg southern california nice cool weather no radio on with average morning going to work type of traffic on streets.
we were in a small parking parking space pulling out to leave... prolly 20 parkings like 6-7 cars in lot, i noticed no car onn either side while i backed out... why did we have the same dream at the same time about eachother being in it and able to talk in and out of dream sleeping and able to realize the dream and slowly wake ourself then eachother up still talking in and out of dream fully aware of all senses in dream and out of dream then able to recall it so emaculately identical with one another together??