בְּשָׁל֣וֹם יַחְדָּו֮ אֶשְׁכְּבָ֪ה וְאִ֫ישָׁ֥ן כִּֽי־אַתָּ֣ה יְהוָ֣ה לְבָדָ֑ד לָ֝בֶ֗טַח תּוֹשִׁיבֵֽנִי׃
In peace will I both lay me down and sleep; for Thou, LORD, makest me dwell alone in safety.
Read kabbalistic (mystical) interpretation of Psalms 4:9: and classical mystical sources.