Toss and turn in one's bed
In the question: He had difficulty falling asleep. He had sleepless nights.
(Modern Hebrew)
Translation
Expression (Hebrew)
הִתְהַפֵּךְ בְּמִיטָּתוֹ
Definition (Hebrew)
בְּהַשְׁאָלָה: הִתְקַשָּׁה לְהֵירָדֵם. הָיוּ לוֹ נְדוּדֵי שֵׁינָה.
(הָעִבְרִית הַחֲדָשָׁה)