"Mobile phones and computers have long-researched negative effects on sleep; but with a few simple tweaks, you can effectively use electronic dream journals, while minimising the impact which electronic screens have on your dreamlife"
Keeping a dream journal is the foundation for lucid dreaming practice, aiding with dream recall, motivation and overall success with lucid dream induction. Traditionally, dream journals take the form of dedicated notebooks or journals, kept at ones bedside ready for recording dreams upon waking.
Check out Dream Journalling 101
However, in an age where every aspect of our lives has a digital chaperone, it's not surprising that many lucid dreamers have opted for mobile phones, tablets or computers as their chosen platform for dream journalling. There are a few issues that arise when swapping out good old fashioned pen and paper with its digital successor.
First and foremost, electronic screens are notorious for their negative impact on sleep quality. Exposure to blue light emitted by electronic screens late at night can disrupt sleep, decrease melatonin secretion, and even worsen sleep disorders.  It's easy to imagine how sleep disruption can impact your success with inducing lucid dreams. For this reason, many lucid dreaming experts and gurus recommend staying away from electronic devices before and during sleep time.
Another issue is one of security. For many, dreams are precious memories, like a treasured photograph or home recording. If something bad were to happen, phone down the bog, laptop stolen, all those precious memories would be lost forever...
The good news is, that with a few (very) simple tweaks, you can minimise the aforementioned drawbacks, making electronic dream journalling a viable option.
f.lux is an application which automatically adjusts your screen to display to filter out 'alerting' light. If you're using a tablet or computer, installing f.lux is free and easy (visit justgetflux.com). Currently, f.lux is only available for jailbroken iOS devices, however Apple has announced the upcoming feature "Night Shift" to future iOS releases (which also allows the user to toggle blue light emission).
Update: Apple iOS 9.3 now features Night Shift - good news for iPhone loving oneironauts.
Or, if you can't install f.lux
A number of 'clones' exist on the Apple Store and Google's Play Store - but these simply tint the screen with a red filter. This being said, when you wake in the middle of the night ready to record every little detail of the thrilling lucid dream you just enjoyed, a red tinted screen set to minimum brightness is much, much easier on the eyes.
Keep it simple
There are some nice mobile apps, online and desktop solutions for dream journalling or regular note taking. However, shortening the number of steps you need to take before you start typing dreams down will make it easier to remember more details. Having a password or lock for your device is always recommended for security, but once you've unlocked/logged in, you should be able to open your dream journal quickly without having to think too much about it. Open a new note and date it before going to sleep.
Use a note taking application with white text on a black background. This will help to reduce the amount of light that you're exposed to whilst recording your dreams.
Back your dreams up
Many mobile note-taking apps have a free online back-up feature. Evernote is another great solution for electronic dream journalling, as it can be installed and used on multiple devices. There is also the option to encrypt text on the desktop version of Evernote.
1. Duffy, J. and Czeisler, C. (2009). Effect of Light on Human Circadian Physiology. Sleep Medicine Clinics, 4(2), pp.165-177.