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Xanathar's Guide to Everything (p. 56) adds Aspect of the Moon as an option for one of their Eldritch Invocations:

Aspect of the Moon

Prerequisite: Pact of the Tome feature

You no longer need to sleep and can't be forced to sleep by any means. To gain the benefits of a long rest, you can spend all 8 hours doing light activity, such as reading your Book of Shadows and keeping watch.

What exactly is considered "light activity" for the purpose of this invocation? For example, would casting a spell, casting a ritual, making a short rest, copying spells and/or using a tool be considered light activity?

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  • \$\begingroup\$ That ability would be handy in real life. If I could read all night, I could get another degree ;-) \$\endgroup\$ – Jesse Cohoon Aug 2 '18 at 2:43
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From the 5e SRD rules on resting (p. 87) one can find the definition of light activity (emphasis mine):

A long rest is a period of extended downtime, at least 8 hours long, during which a character sleeps or performs light activity: reading, talking, eating, or standing watch for no more than 2 hours.

By contrast, strenuous activity is defined right after:

If the rest is interrupted by a period of strenuous activity—at least 1 hour of walking, fighting, casting spells, or similar adventuring activity—the characters must begin the rest again to gain any benefit from it.

This means that this feature is effectively changing the usually required 6 hours of sleep and 2 hours of light activity (as indicated in errata, see this related Q/A), allowing you to spend all 8 hours doing light activity instead.

The light/strenuous activity distinction is not changed so the quoted definitions should apply as normal.

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  • \$\begingroup\$ Here's the corresponding section of the basic rules on DNDBeyond: dndbeyond.com/compendium/rules/basic-rules/adventuring#LongRest \$\endgroup\$ – V2Blast Aug 1 '18 at 19:19
  • \$\begingroup\$ Ok, that makes me ask: if you're testing at night and get jumped by goblins and slay them all in five minutes (combat is fast)...does that not count because it wasn't an hour? Or is the hour qualifier only on "walking"? \$\endgroup\$ – Draco18s Aug 1 '18 at 23:28
  • \$\begingroup\$ @Draco18s Check this related Q/A for that \$\endgroup\$ – Sdjz Aug 2 '18 at 0:57
  • \$\begingroup\$ The linked errata seems to somewhat change the interpretation. In the eratta'd version (at least as I read it), any length of watch is still considered "light activity". \$\endgroup\$ – mbrig Aug 2 '18 at 4:29
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The description of a long rest is given in the PHB and on D&D Beyond. Partially, it says:

A long rest is a period of extended downtime, at least 8 hours long, during which a character sleeps or performs light activity: reading, talking, eating, or standing watch for no more than 2 hours.

"Light activity" is "reading, talking, eating [,] standing watch for no more than 2 hours" or other things of that kind.

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  • 2
    \$\begingroup\$ Now is that the left kidney or the right one? I love the auto-correct on phones XD \$\endgroup\$ – Joshu's Mu Aug 1 '18 at 17:34
  • \$\begingroup\$ @Joshu'sMu Neither left nor right. Using "of that kidney" was deliberate. \$\endgroup\$ – Pilchard123 Aug 2 '18 at 8:43
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The rules for a long rest mention examples of light activity as "reading, talking, eating or standing watch".

It also mentions that a long rest is interrupted by at least 1 hour of strenuous activity which it lists as "walking, fighting, casting spells or similar adventuring activity".

It seems reasonable that casting a few spells or ritual spells (as long as it doesn't take too long or requires physical activity), copying spells or other activity that takes little time and can be done while relaxing is probably OK.

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  • \$\begingroup\$ Casting spells of any kind is considered "strenuous activity"; by definition, it's not "light activity". That said, I'd assume it still follows the overall rules of not interrupting the long rest unless you spend more than an hour doing it. \$\endgroup\$ – V2Blast Aug 1 '18 at 19:22

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