YahClick Free Zone allows un-metered downloads between 1am & 6am SA time

But what if you don't want to stay up to set your downloads going...

Solution for the sensible people using Firefox just add the

Download Scheduler addin

https://addons.mozilla.org/en-us/firefox/addon/download-scheduler/contribute/roadblock/?src=dp-btn-primary

Instructions and simple how-to use it here https://sites.google.com/site/downloadscheduler/