When Can I Sleep On My Lull Mattress? Timing, Setup, and What to Expect

If you’ve just unboxed a new foam mattress and you’re wondering “When can I sleep on my Lull mattress?”, you’re not alone. Many people are unsure how long they should wait after unboxing, how much time the mattress needs to expand, and what’s normal during those first few nights.

This FAQ-style guide walks through the most common questions about timing, comfort, and setup so you can use your new mattress safely and confidently.

How Soon Can I Sleep on a New Foam Mattress After Unboxing?

Most compressed foam mattresses are designed so that you can usually sleep on them the same day you open them, often within a few hours.

After you remove the plastic and let the mattress expand on a flat, supportive surface, it typically reaches a usable shape fairly quickly. Full expansion can take longer, but that does not always mean you must wait that entire time to lie down on it.

In general:

  • It’s common to wait a few hours before sleeping on a newly unboxed foam mattress.
  • The mattress often feels a bit firmer at first, then softens slightly as it expands and as you use it.
  • If the mattress still looks very compressed or uneven, giving it extra time can help.

If you’re specifically asking “When can I sleep on my Lull mattress?”, think of it in terms of two phases:

  1. when it’s physically safe and functional to use, and
  2. when it feels closer to its intended comfort level.

Does the Mattress Need to Fully Expand Before I Sleep on It?

Not necessarily. Foam mattresses are typically:

  • Usable once they’ve expanded enough to look flat and supportive
  • Optimal after they’ve had more time (often up to a day or more) to fully rise

Lying on the mattress early usually does not stop it from expanding, but you might notice:

  • A slightly firmer feel on the first night
  • Edges or corners that continue to round out and rise over the next day or two

If the room is very cool, expansion can be slower. A moderate room temperature often helps the mattress reach its full shape more quickly.

What About Odor? Is It Safe to Sleep on Right Away?

Many new foam mattresses have a temporary “new mattress smell” when first opened. This is common with compressed foam and usually fades with time.

If you’re sensitive to smells, you may want to:

  • Let the mattress air out in a well-ventilated room for several hours
  • Keep windows open or a fan running to help the odor dissipate
  • Wait until the scent is mild or unnoticeable to you before spending a full night on it

For many sleepers, the smell is tolerable enough to sleep on the mattress the first night. Others prefer to wait overnight to let the odor reduce further.

Will Sleeping on It Too Soon Damage the Mattress?

Foam mattresses are generally engineered to handle being used soon after unboxing. Normal use shortly after opening is unlikely to damage the mattress if:

  • It’s placed on a flat, supportive base or foundation
  • The foam has expanded enough that it is not heavily creased or folded
  • You are using it as intended (for sleeping or resting)

However, if the mattress still looks very compressed, sharply folded, or uneven, giving it more time to rise can help it settle properly before regular use.

How Will the Mattress Feel Over the First Few Nights?

Many people notice that the mattress changes slightly over the first days and weeks:

  • It may feel firmer on night one than it will after some break‑in time
  • Foam layers can become more responsive as they are used
  • Your body may need a short adjustment period if you’re switching from a very different type of mattress

This is normal, and it often helps to give yourself several nights to get used to the new feel before deciding if the comfort is right for you.

✅ Quick Mattress Takeaways

Key points consumers should understand about “When Can I Sleep On My Lull Mattress”

  • Same-day use is common: Many sleepers use a new foam mattress within a few hours of unboxing once it looks fully expanded and flat.
  • Full expansion takes longer: The mattress may continue to rise and soften over the next 24–48 hours.
  • Early use is typically fine:Normal sleeping on the mattress soon after opening usually does not prevent full expansion.
  • Smell may be noticeable at first: A temporary new-foam odor is common; airing out the room can make first-night use more comfortable.
  • Initial firmness is normal: Expect the mattress to feel slightly firmer at first, then adjust as the foam breaks in.
  • Supportive base matters: Always place the mattress on a stable, supportive surface before sleeping on it.

Final Thoughts: Finding the Right Timing for You

When you ask “When can I sleep on my Lull mattress?”, the practical answer is usually the same day you unbox it, once it has expanded enough to look even and supportive. From there, the feel and performance often continue to settle over the next few days.

If you allow for a bit of airing out time, check that the mattress is properly expanded and supported, and give yourself a short adjustment period, you can start using your new bed with realistic expectations and greater comfort.