Both. There are two scenarios where I&#x27;m staying up until 4am.<p>1. My three bosses were harassing me all day about deadlines. At home I can&#x27;t sleep because of the stress: &quot;I&#x27;m not going to sleep until I fix this bug because we have a deadline.&quot; =&gt; useless and unproductive. Net negative productivity.<p>2. Quiet day at the office. Just had a decent meal with friends. Get home to a quiet house at 9pm. Flip the computer on not even planning to work. &quot;Hmmm... wait a sec this is interesting. I wonder if I could... What time is it? Is that the sunrise?&quot; =&gt; likely did something in one night that would take weeks&#x2F;months in an office setting.