"Thy word is a lamp unto my feet, and a light unto my path." (Psalm 119:105)
The unknown universe
Speaking of waiting, while we know the sun's still around, the starlight we enjoy at night comes from stars long dead and burned out (in some cases, mind you and I'm not an astronomer). Now, in allaying any ambiguity as I am about to launch out on metaphor regarding angels and whatnot, any fallen angel is indeed long dead. Some light, you gotta watch out for.
"Then he said unto me, Fear not Daniel: for from the first day that thou didst set thine heart to understand, and to chasten thyself before thy God, thy words were heard, and I am come for thy words." (Daniel 10:12)
"So shall my word be that goeth forth out of my mouth: it shall not return unto me void, but it shall accomplish that which I please, and it shall prosper in the thing whereto I sent it." (Isaiah 55:11)
"And this is the confidence that we have in Him, that, if we ask any thing according to His will, He heareth us: And if we know that he hear us, whatsoever we ask, we know that we have the petitions that we desired of Him." (1 John 5:14-15)
Proof-texting admittedly, but if you lace these three pieces of scripture together, you're able to form a simple-yet-powerful structure surrounding the answer to our prayer—whatever it may be. The angel tells Daniel he was sent the moment Daniel prayed. I'm guessing—if I may be so forward—that if you're up on modern-day Christian-y parlance, you might think I'm merely running through a "name it and claim it" understanding of appropriating things from God that we want and need. Firstly, I'm going to say that God meets all our needs (see Philippians 4:19). There's always a fine line between wanting more, contentment, and not needing anything. And so, wresting the argument out of materialist territory, let's look at it in light of "Thy kingdom come, Thy will be done."
A constellation of constituent parts
"Who coverest thyself with light as with a garment: who stretchest out the heavens like a curtain. That thou givest them they gather: Thou openest thine hand, they are filled with good." (Psalm 104:2, 28)
It can be hard to jump into this and jettison any notions we have around these doctrines. We're waiting for God in the broadest sense ("Even so, come, Lord Jesus." Revelation 22:20) and also for the particulars. In scaling down our grasping for more, we'd do well to consider just how much we have. I talk to my friend who is heading off to Nicaragua to teach English over the Summer and I'm reminded of that statistic I read way back when saying if you have a job and a roof over your head (nothing else), you are richer than some exorbitant percentile. "And having food and raiment let us therewith be content." (1 Timothy 6:8) Says Paul. So why ask of God? Certainly, there are always things we'd like to receive. Look at it though in light of what Daniel went through. He was living in Babylon, surrounded by an inverted pantheon (if that makes sense) and so the angel had a rougher go of it. I imagine a resplendent being wandering through a bustling ancient city, parchment in hand, looking for "Daniel". He arrives and says "thy God". Evidently there was more than one around. And all kidding aside, I doubt that's what it looks like. It is serious what angels go through to appropriate the light we need to both see what God would have for us and also prepare us to receive and also protect the gift, whatever it may be.
"And the light shineth in darkness; and the darkness comprehended it not." (James 1:5)
Here's the thing. The light is on the way the moment you pray. Jesus says as much. And whether we have yet to see it because it's not yet night or it just hasn't reached us, keep praying, "chasten[ing] thyself before thy God." and waiting. To chasten thyself, in this case means any- and everything from fasting to austerity to contentment. They say as one is starving to death, after a long while, the most wonderful peace envelops. Obviously, it doesn't have to reach that point but you get the idea. Our God is more than enough, it's just, sometimes, the spiritual atmosphere has to change in order for you to receive the light you need. That is the point I am getting at, all dangling prepositions aside.
In closing and odd as it might sound, look up "quasar" (extragalactic...?). If you need something like that for your life, know that God is good for it. It's more-than-likely something that is covered under "Thy will be done" and also, what you want (or need) for you life and call. Blessings to you!