narrow down midnight sleep time

coin.rb

@@ -112,7 +112,7 @@ loop do
   # if max coins per day has reached, sleep until midnight
   if coins_offered_today >= MAX_COINS_PER_DAY
     sleep(get_seconds_to_midnight(Time.now))
-    sleep(get_random_hours(0, 11))
+    sleep(get_random_hours(5, 11))
     coins_offered_today = 0
   end
 end