Every affliction to befall man has a set time to end; as it is written (Job 28:3), "An end He set to darkness, and every limit He investigates."
Dawn (Alot Hashachar)
Earliest Tallit and Tefillin (Misheyakir)
Sunrise (Hanetz Hachamah)
Midday (Chatzot Hayom)
Nightfall (Tzeit Hakochavim)