We asked our readers to send in their pictures on the theme of "night vision". Here are some of the pictures sent to us from around the world.
John West
John West: "This cyclist seemed so vulnerable on a dark January evening amongst all the traffic at a busy Edinburgh junction."
Ian Salisbury
Ian Salisbury: "The pupil of a leopard's eye constricts or dilates rapidly according to the amount of light that is available. Because of their adapted retinas, leopards have exceptional night vision and can see seven times better in the dark than humans, which results in them being very successful nocturnal hunters. Photo taken at night whilst on safari in Zambia's South Luangwa National Park."
Brandon Ellison
Brandon Ellison: "Peering out of my study window late at night, everything in darkness apart from a few house lights and the distant glow of London bouncing off the clouds. (Taken with a 360 camera.)"
Lynka Belanger
Lynka Belanger: "Like many lakes around the world, the Memphremagog Lake has a monster… here is a close-up of Memphre's head decorated for Christmas."
Julia Uttley
Julia Uttley: "I love the work of American artists such as Ed Ruscha and Edward Hopper and during the early stages of lockdown, I tried to recreate the atmosphere of some of their work using a newly built service station as my subject that's just up the road from where I live."
Kerr Rankin
Kerr Rankin: "On our final night camping on the Isle of Lewis we were greeted by the Milky Way."
Dean Johnson
Dean Johnson: "I took this self-portrait while spending the night in a Bedouin tent in Wadi Rum, Jordan. I knew the distinct lack of light pollution would enable me to see the stars but nothing prepared me for this."
Jake Bernard
Jake Bernard: "The photograph was taken in my urban garden using an infra-red camera with motion sensor. Endless hours of fun - noting who and what happens at night, just outside the back door."
Michael Chalmers
Michael Chalmers: "I took the photo of the full Moon from my back deck in Canton, Georgia, USA, early morning (around 04:30) on 3 September."
Ola Maddams
Ola Maddams: "I've always loved the fact that once we go to sleep our garden comes to life with nocturnal animal activity - hedgehogs, foxes and an occasional badger. This picture captures a moment when a young fox enters our garden through an opening in the bushes."
Jack Chapman
Jack Chapman: "This was a new Moon night taking long exposures at Superstition Mountains, Arizona."
Conor Georgiou
Conor Georgiou photographed Comet Neowise (bottom left), the rising Moon (bottom centre) and the Milky Way. This was taken from Kinder Scout in the Peak District.
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Cyd Hindle
Cyd Hindle sent in this picture called Silent City: "This image was taken around 04:30 on the Roman walls in the city of Chester."
Simon Frost
Simon Frost: "Even darkness can't halt a key game of ping pong when phone torches can bring night vision."
The next theme is "open road" and the deadline for entries is 29 September 2020.
Send pictures to [email protected] or follow the link below to "Upload your pictures here".
Further details and terms can be found by following the link to "We set the theme, you take the picture", at the bottom of the page.
John West
Ian Salisbury
Brandon Ellison
Lynka Belanger
Julia Uttley
Kerr Rankin
Dean Johnson
Jake Bernard 
Michael Chalmers
Ola Maddams
Jack Chapman
Conor Georgiou
Cyd Hindle
Simon Frost