We have learnt a lot working with our fantastic customers ranging from what content gets the best results through to what send times make the biggest difference. In particular we discovered two things that were pretty consistent; First, morning send times work great, and secondly, nobody likes getting up early to send emails! To solve both issues we are introducing scheduled emails!
To schedule an email choose "schedule email" from the options menu on the Compose page. Then simply set the desired date and time to send your email. Scheduled emails will appear in the Messages page, and will be sent automatically at the chosen time. Enjoy your sleep-ins!