The Bible quite clearly tells believers not to worry
True enough, but we are supposed to be awake, be sober, be ready, not asleep.
Matt 24:44; "For this reason you also must be ready; for the Son of Man is coming at an hour when you do not think He will.
Luke 12:40; "You too, be ready; for the Son of Man is coming at an hour that you do not expect."
Luke 12:47; "And that slave who knew his master's will and did not get ready or act in accord with his will, will receive many lashes,
Matt 24:42; "Therefore be on the alert, for you do not know which day your Lord is coming.
Matt 24:43; "But be sure of this, that if the head of the house had known at what time of the night the thief was coming, he would have been on the alert and would not have allowed his house to be broken into.
Matt 25:13; "Be on the alert then, for you do not know the day nor the hour.
Mark 13:3;3 "Take heed, keep on the alert; for you do not know when the appointed time will come.
Mark 13:34; "It is like a man away on a journey, who upon leaving his house and putting his slaves in charge, assigning to each one his task, also commanded the doorkeeper to stay on the alert.
Mark 13:35; "Therefore, be on the alert—for you do not know when the master of the house is coming, whether in the evening, at midnight, or when the rooster crows, or in the morning—
Mark 13:37; "What I say to you I say to all, 'Be on the alert!'"
Luke 12:37; "Blessed are those slaves whom the master will find on the alert when he comes; truly I say to you, that he will gird himself to serve, and have them recline at the table, and will come up and wait on them.
Luke 21:36; "But keep on the alert at all times, praying that you may have strength to escape all these things that are about to take place, and to stand before the Son of Man."
1Thes 5:6; so then let us not sleep as others do, but let us be alert and sober.