A call to prayer comes in many forms. In this case, we do not mean a literal call such as by a Muslim muezzin, or even from Christian church bells. Certainly these are calls, and you may follow them as you wish, but they are meant for anyone in hearing distance. We assume this is not happening to you at 03:00.
Your call is a more personal one. It could be coming from a worry or perhaps from some higher source.
Worries come in many varieties: Personal, professional, financial, health, family, even spiritual. They fill our days and invade our nights, disturbing our sleep and sneaking into our dreams. You might find yourself dreaming about the very things that torment you during the day, tossing fitfully and waking in a sweat, heart pounding as you work to recall just what happened that made you feel this way. If you find prayer a comfort, then it is natural that you would turn to prayer in these wretched wakeful moments to soothe your soul and lead you back to rest.
This is even truer if your trouble is spiritual in nature. How better to solve a spiritual problem than with spiritual reflection?
Perhaps, though, you are free of worries but being awakened anyway. You are resting peacefully, slumbering deeply, dreaming away … and then sitting up straight, wide awake, with a feeling you cannot shake.
In the Christian Bible, Samuel runs to Eli in the night, believing that is who is calling him. It is not until this happens a third time that Eli realizes God is calling the boy and he advises Samuel, if this should happen again, say, "Speak, Lord, your servant is listening.”
If you are feeling these calls, open your heart and declare yourself willing to listen and be led. Your Lord will let you know what to do next.