Q. Regarding the above questions (2898-99) on davening before dawn. Can one say Pesukei Dezimra before the alos (dawn)?
A. Sha’arei Teshuva (664) quotes Maharil that one should avoid saying Pesukei Dezimara at night, Mekadeh Yisroel (Shavuos 41) is also stringent, as is Rivavos Efraim, reasoning that since they are compared to Halel, they can only be recited during the day (Rivavos Veyovlos p.7).
However, many Poskim permit reciting Pesukei Dezimra in time of need before alois (dawn) until Yishtabach. (Da’as Torah 28, and 664 quoting P’ri Megodim, Teshuva Mehava 1: 221, Tehila Ledavid 58, Birur Halocho 51 : p. 127, Siach Tefilo, and others, see also Mishna Berura 89: 40).
Horav Shlomo Miller’s Shlit’a opinion is that in need one may be lenient. However, one should be careful to observe the other time requirements, such as the right time for donning the taalis and the tefilin, as well as for reading the shema.
Rabbi A. Bartfeld as advised By Horav Shlomo Miller and Horav Aharon Miller Shlit’a