I believe this song is about drugs, LSD or something similar. May also be DMT.

"Gotta be fresh, gotta go downstairs
Gotta have my bowl, gotta have cereal
Seein' everything, the time is goin'
Tickin' on and on, everybody's rushin'
Gotta get down to the bus stop"

She wakes up and needs to have her "bowl" the primary piece of a water bong, which is what drugs are usually smoked from. "Cereal" is clearly a metaphor for the drug.

The "Tickin'" and "Rushin" are referring to your sense of time while high and how it is drastically altered and the intense body rush you get.



"7:45, we're drivin' on the highway"

This line describes LSD more so than DMT. Driving on the highway means she is well into her trip.


"Cruisin' so fast, I want time to fly"

She's now peaking.



"Tomorrow is Saturday
And Sunday comes after wards"

This verse is probably most meaningful, but also the hardest to decipher. I haven't come up with the exact meaning of it yet but this is what I have so far:


These lines are referring to childhood, when we were still learning simple things. She's saying that when high on LSD, you are carefree, you don't worry about work/school or whatever, you are just one with nature and the world is beautiful. This is also what it's like to be a child.

Sauce:
http://www.songmeanings.net/songs/view/3530822107858863257/