The five guides that travel with a Memodyne order

The seller totals the bundle at $255. A stated value is the seller's own figure for a digital download.

A bundle of five arrives at once and most of it will never be read, so it is worth saying which one to open.

Sleep Live Better, and not because it is the longest or the most expensive by the seller's own reckoning. It is the only title in the bundle whose subject carries randomised evidence for cognitive outcomes in adults, and it is the only one whose advice is free to act on tonight. For a reader who arrived at this shelf because of a small, repeated lapse of attention, sleep is a more likely explanation than anything a capsule addresses.

The 10-Day Active Mind Challenge is second, for a different reason. It is a habit structure, and habit is what decides whether a once-daily capsule survives to week six. A bottle that outlasts its month is the commonest way a fair test of this product fails.

The other three are reference material. None of them is a treatment, none carries citations, and the word cure in one of the titles is the seller's rather than this desk's.

Digital delivery is where a bundle most often goes wrong, and the failure is nearly always mundane rather than sinister.

The guides are sent to the email address entered at checkout. That is not always the address a buyer reads mail on, particularly where a payment account autofills an old one, and it is the first thing to check. The second is the spam folder, because a message carrying several download links from a sender a mailbox has never seen before is exactly the shape of a message that gets filtered.

The guides also travel separately from the bottles and usually arrive first, so a buyer waiting for the parcel to bring them will conclude they are missing while they are already sitting in an inbox.

If none of that resolves it, the order desk on +1 (302) 200-3480 handles digital delivery as well as the bottles. The website mailbox cannot see an order and cannot resend anything.

A bundle of digital guides is the commonest sweetener in this category, and the honest way to weigh one is to ignore the stated values entirely and look at what the step between two packs costs.

Moving from two bottles to three costs $49 more. For that, a buyer gets a third bottle, which is another thirty days of capsules, plus free United States shipping instead of a charge at checkout, plus the five guides. The extra bottle alone is worth more than the step, before the shipping and the guides are counted at all.

Moving from three bottles to six costs $87 more and adds three bottles. The guides do not change, because they already came with the three-bottle pack. So the bundle is a reason to step up once, from two to three, and it is not a reason to step up twice.

That is the useful way to read a bonus bundle anywhere: as a tiebreaker between two adjacent packs rather than as a sum of money being handed over.

The guides attach once, at three bottles. They are not a reason to choose six over three.