Habits are powerful cycles of cues, routines and rewards, with much research having been done on the process of making and breaking them.
Here are 5 habits that I have formed (one that's still in the works), over the past few years that I don't even think about now but save me time, money and sanity every single day. Simple things, powerful life savers in mundane disguises!

2: Clearing my inbox every night. I realise this one is a different ball game for people who send and receive a lot of emails for their job or personal life. I probably receive about ten emails on average per day, which is a manageable size to maintain this habit. As I am getting ready for bed, I clear my inbox completely... I put emails in folders if they have been dealt with, or I reply and file them, delete them or use the snooze function to make them come up as unread when I will have time to address it. There is lots of important information that comes through via email, and with a crowded, maxed out inbox, missing important dates, information or deadlines is bound to happen.
3: Put my clothes out at night. This is the one I get teased for at home... but it feels like a super power. I grab the clothes I want to wear in the morning and leave them out on my desk, and when my alarm goes off and I roll out of bed, my brain isn't forced into decision making mode before it's fully functioning. There's not much more I can say about this one. Try it for a week at least.
4: Using cash for nearly everything. In this current season of life, I'm not working much and I'm on somewhat of a tight budget. I have tried recording what I spend each month and keeping track of what I buy... I can't seem to stick with it. So instead, I have made a budget that works for the month, and at the start of the month I get out in cash the amount that I have available to spend. When the cash is gone, there's no more spending, which is hopefully in the last couple of days of the month (doesn't always work but I'm getting better).
5: Scheduling things to take longer than they will. This is the one that I am just in the process of making a habit, but I have seen it's benefits already! When I plan something in my schedule (I use Google calendar), I set it starting earlier than it will and finishing later than it probably will. For a long time I consistently planned things back to back, not considering the physical and mental time it takes me to transition between things. By extending how long something will take, I am learning to protect that margin time, give myself time to transition or if needed, the time for things to run longer than expected without making me late for something else.
I would love to hear what habits other people have built into their life as savers of time, energy and sanity!