Rather than wasting time, you might as well go to bed early.
Tips
grammar
与其 is always paired with 不如 (bùrú) or 还不如 (hái bùrú): 与其A,不如B means 'rather than A, better to B'. The preferred option comes after 不如.
mistakes
Don't confuse 与其...不如 with 宁可...也不 (nìngkě...yě bù). 与其 presents a rational comparison; 宁可 expresses a strong willingness to endure something to avoid the alternative.